They can range in size from just a few inches tall to more than 12 feet in the case of the tree ferns. Some types of ferns are tropical. Others quite hardy. Their versatility aside, ferns are valuable in the home and garden because they prefer shade. In the landscape, ferns bring fresh green life to those hard-to-design dim corners.
Prokaryotic cells have various shapes; the four basic shapes are: Cocci - spherical Bacilli - rod shaped Spirochaete - spiral shaped Vibrio - comma shaped.
Prokaryotic cells are simple, one-celled organisms; such as bacteria. All other life is composed of Eukaryotic cells. Not surprisingly, Prokaryotic cells are far simpler in structure and they are also much smaller than Eukaryotic cells. Eukaryotic cells are around 15 times wider and can be up to 1,000 times larger in volume. In addition to having a nucleus, Eukaryotic cells have a nucleolus containing the cell's DNA, as well as specific membrane-bound compartments, organelles, where specific metabolic activities occur. Prokaryotic cells do not have a nucleus or contain these more complex inner structures.